Insulator



H. H. COCHRANE.

ms'uLAToH.

v APPLICATltlN' FlLED APR. 21, 1915.

Pat'ented Aug. 15, 1916.

NVEN'U'? Harry H. Cochran ATTORNEYS UNITED sTATEs HARRY HAMILTNCOCHRANE, OF BUTTE, MONTANA.

INSULATOR.

Specication of Letters Patent.

Patented Aug. 15, 1916.

Application filed Apri'121, 1915. Serial No. 22,831.

To all whom. it may concern.'

Be it known that I, HARRY H. COCIIRANE,

" a citizen of the United States, and a resi dent of Butte, in thecountyl of Silver Bow and State of Montana, have invented a new andImproved Insulator, of which the fol lowing is a full, clear, and exactdescription.

My invention relates to insulators and has reference more particularlyto insulators for electric currents of high potential.

The object of the invention is to provide Aa simple, strong, etlicientand durable insulator characterized by the provision of a centralinsulating core of fibrous nature sealed in replaceable, protective,insulating shells so that the core therein is protected 'fromatmospheric influence.

With the above and other objects in view, the nature of which will morefully appear as the description proceeds, the invention consists in thenovel construction, combination and arrangement of parts as herein fullydescribed, illustrated and claimed.

In the accompanying drawings, forming 3 part of the application, similarcharacters et reference indicate corresponding parts in all the views.

Figure 1 is a. vertical, central section through my insulator; Fig. 2yis a horizontal section on line 2 2, Fig. 1; and Fig. 3 is a similarsection on line 3-8, Fig. 1.

Referring to the drawings, 4 represents a fibrous rod, preferably 'ofhickory. This rod constitutes the core of the insulator.

' The ends of the rod 4 are reduced and therethe diameter of the rod, sothat the same lits snugly over the rod. At one end of the tubularsection a concave-convex Iiange 1l is provided which depends from thetubular section and which forms the petticoat oi the shell. Locatedwithin the petticoat is an annular collar 12 concentric with the tubularportion 10 and`of a diameter' such as to engage the end of a successiveshell 9. The engagement between the collar 12 and the tubular portion 10of the successive shells is such thail sufficient play therebetween islett to accommodate cement. In view of the fact that the inner diameterof the collar 12 is greater than the inner diameter of the tubularportion, an annular shoulder 13- is formed within each shell.

The metallic cup 5 at one end of the core receives a metallic cap 14which is threaded on to the cup 5 and the outer diameter of which cap 14is substantially equal to the outer diameter of the tubular portion 10of the shell, so that the same will tit loosely into the collar of ashell 9 placed on to the core to engage the cap. The shoulder 13 of eachshell carries a gasket 15, preferably formed of an insulating material,such as paraffin, pitch or bitumen,l which seals the contacting ends ofthe successive shell as well as the engaging end of the cap 14. The

space between the cap 14 and the collar is closed by cement ofinsulating character, as is also the space between the successivetubular portions and the collars in engagement therewith, as shown inFig. 1. Secured to the cup 5 at the other end of the rod 4 is a cap 16which has a central recess 17 of sub stantially the same diameter as theinner diameter of the collars 12, so that the same will accommodate thetubular portion 10 or the shell adjacent the said end where the cap 1Gis provided. The clearance in the recess is also cemented, so that thecore is perfectlyr sealed within the series of shells and the capscarried by the ends of the core. Vllhere` fore, the same is insulatedfrom the atmos` phere, and, consequently, will not be a llected by thechanges thereof and will be immune from humidity, which is the cause ot'many troubles in insulators for currents otl high I potential.

The caps 14 and 16 are each provided with a staple 18 whereby the entireinsulator can be supported and attached to cariv the conductor. Thefibrous core is preferably impregnated with an insulating compound. suchas oil or paraiin. rlhe transverse re;

` sistance ot such a core is very great, as the fibers are disposedlongitudinally. It is substantially inflexible, and, consequently,"

rod, metallic cups crimped if) he ends of the rod, if" u' ehi-111gere-ilona enge@ ing the rod, 110mm@ 'ihreade enga gement W i ih ih eintermedee the tu eniing tbe L the @am pose Cil WIS iT and means ratedwith an nsuaing compound and forming the cere, tubular insulatingsections tng snugly on to the rod, each of Seid sections having a.petteeut and un annular collar Within the petteozvh adapted tof1eeommodate the end of the succeeding See- -on7 am insulating gasketwithin the :mmv ler edler, ,metallic cups crimped 'to the ends of therod, metallic caps in threaded engagement 'with the, cups :1nd inengagement with the adjacent tubular seuion's, und means sealing the@ennemi-ion between the engaging seelons und the sectens engaging thecaps.

testimony whereof l beve Signed my 31eme to this s eefeuon in thepresenee of EWG Subscribing witnesses.

ses: y. C. TUJLOTSON, ACOB AUTHOMESEN.

